fix: remove duplicate TestCompactTier1_DryRun

[maphew]

Summary

• Remove duplicate TestCompactTier1_DryRun function from internal/compact/compactor_unit_test.go
• Fixes CI build failure from duplicate test function

[codecov-commenter]

❌ 1 Tests Failed:

Tests completed	Failed	Passed	Skipped
4804	1	4803	548

View the top 1 failed test(s) by shortest run time

github.com/steveyegge/beads/cmd/bd::TestGetVersionsSinceOrder

Stack Traces | 0s run time

=== RUN   TestGetVersionsSinceOrder
    version_tracking_test.go:80: Versions not in chronological order: 0.61.0 (2026-03-15) should come before 0.57.0 (2026-03-01)
--- FAIL: TestGetVersionsSinceOrder (0.00s)

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[DreadPirateRobertz]

Clean fix — removes the duplicate test function. LGTM.